SHORT CREVIX and scared!! 😭😥

I found out last Monday at my 21 week ultrasound that my cervix was 1mm I went back 3 days later to find it shrank to .5mm. My doctor says she doesn't want to try the cerclage because with twins it can cause more complications. As of now I'm on strict bedrest and taking progesterone pills vaginally every night. Has anyone else experienced something like this? Positive stories would b great. I just want to make it to at least 30+ weeks with my twin girls 😥👶🏽👶🏽